MESON Chess Problem Database
Problem Display
PID: 11593 (2Kn1n2/1NPPP1R1/R1N1kqb1/b1r2rP1/4P3/B6Q/8/8 w - - 0 1)
Froberg, Johan Hilding Laurentius
1st Prize, Vart Hem, 1939
#2
12 + 8
| 23 | Die Schwalbe | 2004 |
SOLUTION
- SOUND
- Sets
- 1...Qa1
- 2.exd8S#
- 2.exf8S#
- 1...Qb2
- 2.exd8S#
- 2.exf8S#
- 1...Qc3
- 2.exd8S#
- 2.exf8S#
- 1...Qd4
- 2.exd8S#
- 2.exf8S#
- 1...Qe5
- 2.Sd4#
- 2.Scxd8#
- 2.exd8S#
- 2.exf8S#
- 1...Qxe7
- 2.Rxe7#
- 1...Qxg7
- 2.exd8S#
- 1...Qf7
- 2.exd8S#
- 1...Rc1
- 2.Sbxd8#
- 1...Rc2
- 2.Sbxd8#
- 1...Rc3
- 2.Sbxd8#
- 1...Rc4
- 2.Sbxd8#
- 1...Rb5
- 2.Sbxd8#
- 1...Rd5
- 2.Sbxd8#
- 1...Re5
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 1...Be1
- 2.cxd8S#
- 1...Bd2
- 2.cxd8S#
- 1...Bc3
- 2.cxd8S#
- 1...Bb4
- 2.cxd8S#
- 1...Bf7
- 2.exf8S#
- 1...Sf7
- 2.exf8S#
- 1...Qa1
- Tries
- 1.Rxg6?
- threat
- 2.Rxf6#
- 2.exd8S#
- 2.e8Q#
- 1...Kf7
- 2.e8Q#
- 1...Qxg6
- 2.exd8S#
- 1...Rxc6
- 2.e8Q#
- 1...Bxc7
- 2.Rxf6#
- 2.e8Q#
- 1...Sxc6
- 2.e8Q#
- 1...Sxb7
- 2.Rxf6#
- 1...Sxd7
- 2.exd8S#
- 2.e8Q#
- 1...Bc3
- 2.cxd8S#
- 2.exd8S#
- 2.e8Q#
- 1...Sh7
- 2.exd8S#
- 2.e8Q#
- 1...Sxg6!
- threat
- 1.Qxf5+?
- 1...Qxf5
- 2.exd8S#
- 1...Rxf5
- 2.Sbxd8#
- 1...Bxf5!
- 1...Qxf5
- 1.Qh2?
- threat
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 2.Qd6#
- 1...Qxg5
- 2.Sd4#
- 2.Scxd8#
- 2.Qd6#
- 1...Qxe7
- 2.Sd4#
- 2.Scxd8#
- 2.Rxe7#
- 1...Qxg7
- 2.Sbxd8#
- 2.exd8S#
- 1...Rxc6
- 2.Sxd8#
- 1...Bxc7
- 2.Sd4#
- 2.Scxd8#
- 1...Sxc6
- 2.Sd8#
- 2.Qd6#
- 2.d8S#
- 1...Sxb7
- 2.Sd4#
- 2.Sd8#
- 1...Qd4
- 2.Sxd4#
- 2.Scxd8#
- 2.Sbxd8#
- 2.exd8S#
- 1...Qe5
- 2.Sd4#
- 2.Scxd8#
- 2.exd8S#
- 1...Qf7
- 2.Sbxd8#
- 2.Qd6#
- 2.exd8S#
- 1...Rcd5
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 1...Rce5
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 1...Rfd5
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 1...Rfe5
- 2.Sd4#
- 2.Scxd8#
- 1...Bb6
- 2.Scxd8#
- 2.Sbxd8#
- 2.Qd6#
- 1...Bf7
- 2.Sbxd8#
- 2.Qd6#
- 2.exf8S#
- 1...Sf7
- 2.exf8S#
- 1...Rf4!
- threat
- 1.Qb3+?
- 1...Rc4
- 2.Sbxd8#
- 1...Rcd5
- 2.Sbxd8#
- 1...Rfd5!
- 1...Rc4
- 1.Qg3?
- threat
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 2.Qd6#
- 1...Qxg5
- 2.Sd4#
- 2.Scxd8#
- 2.Qd6#
- 1...Qxe7
- 2.Sd4#
- 2.Scxd8#
- 2.Rxe7#
- 1...Qxg7
- 2.Sbxd8#
- 2.exd8S#
- 1...Rxc6
- 2.Sxd8#
- 1...Bxc7
- 2.Sd4#
- 2.Scxd8#
- 1...Sxc6
- 2.Sd8#
- 2.Qd6#
- 2.d8S#
- 1...Sxb7
- 2.Sd4#
- 2.Sd8#
- 1...Qd4
- 2.Sxd4#
- 2.Scxd8#
- 2.Sbxd8#
- 2.exd8S#
- 1...Qe5
- 2.Sd4#
- 2.Scxd8#
- 2.exd8S#
- 1...Qf7
- 2.Sbxd8#
- 2.Qd6#
- 2.exd8S#
- 1...Rcd5
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 1...Rce5
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 1...Rfd5
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 1...Rfe5
- 2.Sd4#
- 2.Scxd8#
- 1...Bb6
- 2.Scxd8#
- 2.Sbxd8#
- 2.Qd6#
- 1...Bf7
- 2.Sbxd8#
- 2.Qd6#
- 2.exf8S#
- 1...Sf7
- 2.exf8S#
- 1...Rf4!
- threat
- 1.exf8Q?
- threat
- 2.Sxc5#
- 2.Qd6#
- 2.Qxf6#
- 1...Qxg5
- 2.Sxc5#
- 2.Qd6#
- 1...Qxg7
- 2.Sxc5#
- 2.Sbxd8#
- 1...Rxc6
- 2.Qxf6#
- 1...Bxc7
- 2.Sxc5#
- 2.Qxf6#
- 1...Sxc6
- 2.Qd6#
- 2.Qxf6#
- 1...Sxb7
- 2.Qxf6#
- 1...Qa1
- 2.Sxc5#
- 2.Sbxd8#
- 2.Re7#
- 2.Qd6#
- 2.Qe7#
- 1...Qb2
- 2.Sxc5#
- 2.Sbxd8#
- 2.Re7#
- 2.Qd6#
- 2.Qe7#
- 1...Qc3
- 2.Sbxd8#
- 2.Re7#
- 2.Qd6#
- 2.Qe7#
- 1...Qd4
- 2.Sbxd8#
- 2.Re7#
- 2.Qe7#
- 1...Qe5
- 2.Sd4#
- 2.Scxd8#
- 2.Sbxd8#
- 2.Re7#
- 2.Qe7#
- 1...Qe7
- 2.Rxe7#
- 2.Qxe7#
- 1...Qf7
- 2.Sxc5#
- 2.Sbxd8#
- 2.Qd6#
- 1...Rc1
- 2.Qd6#
- 2.Qxf6#
- 1...Rc2
- 2.Qd6#
- 2.Qxf6#
- 1...Rc3
- 2.Qd6#
- 2.Qxf6#
- 1...Rc4
- 2.Qd6#
- 2.Qxf6#
- 1...Rb5
- 2.Qd6#
- 2.Qxf6#
- 1...Rd5
- 2.Qxf6#
- 1...Re5
- 2.Sd4#
- 2.Scxd8#
- 2.Qd6#
- 2.Qxf6#
- 1...Bc3
- 2.Sxc5#
- 2.Qd6#
- 1...Bb4
- 2.Qd6#
- 2.Qxf6#
- 1...Bb6
- 2.Qd6#
- 2.Qxf6#
- 1...Bf7
- 2.Sxc5#
- 2.Qd6#
- 1...Sf7
- 2.Sxc5#
- 1...Qxf8!
- threat
- 1.e8Q+?
- 1...Qe7
- 2.Rxe7#
- 2.Qxe7#
- 1...Bxe8!
- 1...Qe7
- 1.e8R+?
- 1...Qe7
- 2.Rgxe7#
- 2.Rexe7#
- 1...Bxe8!
- 1...Qe7
- 1.Rxg6?
- Keys
- 1.Qc3!
- threat
- 2.Scxd8#
- 1...Qxc3
- 2.exd8S#
- 1...Qxg7
- 2.exd8S#
- 1...Rxc3
- 2.Sbxd8#
- 1...Rxc6
- 2.Sxd8#
- 1...Bxc3
- 2.cxd8S#
- 1...Sxc6
- 2.d8S#
- 1...Sxb7
- 2.Sd8#
- 1...Qd4
- 2.exd8S#
- 1...Qf7
- 2.exd8S#
- 1...Bf7
- 2.exf8S#
- 1...Sf7
- 2.exf8S#
- threat
- 1.Qc3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 9
- Sets
- Q(e);OGATE,XP(J)::R1(K),XQ(e)
- Q(e);N_GUARD,XR(K)::PXS(g)=S
- Q(e);N_GUARD::PXS(g)=S
- R(b);::S(G),XS(g)
- B(a);N_GUARD::PXS(g)=S
- B(f);S_CUTQ(e)::PXS(h)=S
- S(g);S_CUTQ(e)::PXS(h)=S
- Tries
- Try
- R(K);P_PINQ(e),XB(f)
- Threat
- DUALS(3)
- Vars
- K(d);N_SPINQ(e),N_SPINR(c),S_FLIGHT::P=Q
- Q(e);N_SPINQ(e),XR(K)::PXS(g)=S
- R(b);P_PINP(H),XS(F)::P=Q
- S(g);P_SPINS(g),XS(F)::P=Q
- S(g);XS(G)::R1(K),XQ(e)
- Refutation
- S(h);N_SPINQ(e),XR(K)
- Try
- Q(B);CHECK,XR(c)
- Vars
- Q(e);N_GUARD,S_CUTB(f),S_CUTR(b),XQ(B)::PXS(g)=S
- R(b);XQ(B)::S(G),XS(g)
- Refutation
- B(f);XQ(B)
- Try
- Q(B);N_PINR(c)
- Threat
- DUALS(4)
- Vars
- R(b);P_PINP(H),P_SPINR(b),XS(F)::S(G),XS(g)
- S(g);S_CUTQ(e)::PXS(h)=S
- Refutation
- R(c);
- Try
- Q(B);CHECK,N_PINR(c)
- Vars
- R(b);P_SPINR(b)::S(G),XS(g)
- Refutation
- R(c);P_SPINR(c)
- Try
- Q(B);N_PINR(c)
- Threat
- DUALS(4)
- Vars
- R(b);P_PINP(H),P_SPINR(b),XS(F)::S(G),XS(g)
- S(g);S_CUTQ(e)::PXS(h)=S
- Refutation
- R(c);
- Try
- P(J);XS(h)
- Threat
- DUALS(3)
- Vars
- R(b);P_PINP(H),XS(F)::QAR1(J),XQ(e)
- S(g);XS(G)::QAR1(J),XQ(e)
- R(b);::QAR1(J),XQ(e)
- S(g);::S(G),XR(b)
- Refutation
- Q(e);XQ(J)
- Try
- P(J);CHECK
- Refutation
- B(f);XQ(J)
- Try
- P(J);CHECK
- Refutation
- B(f);XR(J)
- Try
- Actual
- Q(B);N_PINR(c)
- Threat
- R(E)+S(F),DCHECK,XS(g)
- Vars
- Q(e);N_GUARD,XQ(B)::PXS(g)=S
- Q(e);N_GUARD,XR(K)::PXS(g)=S
- R(b);XQ(B)::S(G),XS(g)
- R(b);P_PINP(H),P_SPINR(b),XS(F)::S(G),XS(g)
- B(a);N_GUARD,XQ(B)::PXS(g)=S
- S(g);OGATE,P_SPINS(g),XS(F)::P=S
- S(g);XS(G)::R(E)+S(F),DCHECK
- Q(e);N_GUARD::PXS(g)=S
- B(f);S_CUTQ(e)::PXS(h)=S
- S(g);S_CUTQ(e)::PXS(h)=S
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).